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我有一个 Ant 展示页面，显示有关各种蚂蚁的详细信息。在该页面上有两个下拉菜单，一个用于环境：[室内、室外]，另一个用于饮食：[糖、脂肪、蛋白质]。

当您从每个参数中选择一个参数时，它会根据参数呈现一个产品页面。但是，某些组合会导致零，例如木蚁没有与室内糖相关的产品。

我正在尝试根据组合是否为零来填充下拉列表。如果有人选择室内，如果该组合不存在，我希望糖不会出现在下一个下拉列表中。

到目前为止，我有两种方法只为可用项目创建 json 数组：

def food_sources
  food_sources = Ant.find(params[:ant_id]).product_recommendations.where(environment: params[:environment]).map(&:diet)
  render json: food_sources.to_json
end

def environments
  environments = Ant.find(params[:ant_id]).product_recommendations.where(diet: params[:diet]).map(&:environment)
  render json: environments.to_json
end

例如，如果输入

http://localhost:3000/ants/27/food_sources?environment=indoor

进入它返回的浏览器

["sugar","protein"]

对于 id 为 27 的蚂蚁来说，bc 只有两个户外室内饮食选项，而不是可能的三个。

我的问题是，如果有人选择了上述组合，我如何将此数组传递到我的 rails 下拉列表中？

编辑

= form_tag ant_product_recommendations_path(@ant.id), id: 'select_box',  method: :get do |form|
  %h3 What food source are they currently feeding on?
  = select_tag :environment, options_for_select([["Select One"], "Indoor", "Outdoor"])
  %h3 
    Locate the nest by following the ants back from their food source.
    %br
    Where is the nest located?
  = select_tag :diet, options_for_select([["Select One"], "Sugar", "Fat", "Protein"])
  = submit_tag "Find Solutions", class: 'submit button' 
  = link_to 'Go Back', '/', class: 'go_back'
4

1 回答 1

7

It seems to me like you want to dynamically populate the dropdown box, which would lend itself to an ajax call, like this:

$('#select_box').on('change', function () {
    $.ajax({
        url: "/controller/action",
        type: 'get',
        data: $(this).serialize()
    }).done(function (data) {
        change_select(data);
    });
});

function change_select(data) {
    var json = jQuery.parseJSON(data);
    var options = [];
    json.each(function (key, index) {
        options.push({text: index, value: key});
    });
    $("#select_box").replaceOptions(options);
};

This will allow you to specify the options of the dropdown, and you can use the controller in this way:

  @food_sources = Ant.find(params[:ant_id]).product_recommendations.where(environment: params[:environment]).map(&:diet)
  respond_to do |format|
    format.json { render json: @food_sources }
  end
于 2013-10-16T08:59:12.583 回答